Process for the manufacture of artificial silk, hair, bands and similar products of diminished luster



Patented Aug. 30, 1932 UNITED STATES PATENT OFFICE JOHANNJ'O SEFSTOCKLY, OF TELTOW-SEEHOF, NEAR BERLIN, AND ERHARD WITTE, FBERLIN-LICHTERFELD, GERMANY, ASSIGNORS, BY' MESNE ASSIGNMENTS, T0AMERICAN GLANZSTOFF CORPORATION, OF NEW YORK, N. Y.

PROCESS FOR THE MANUFACTURE OF ARTIFICIAL SILK, HAIR, BANDS AND SIMILARPRODUCTS OF DIMINISHED LUSTER No Drawing. Application filed April 5,1929, Serial No. 352,894, and in Germany April 5, 1928.

It has already been proposed to add caoutchouc to spinning solutions, inorder to impart to the threads spun from such solutions the valuableproperties of the caoutchouc. For

that purpose it was necessary to dissolve the caoutchouc by means ofsuitable solvents and to incorporate the said solution in order toobtain a homogenous mixture with the viscose.

According to the present invention it is not desiredato obtain ahomogenous dissolution of the caoutchouc in the spinning solution or theproducts produced thereof, but merely on enrulsification of the addedsubstance in the spinning solution and a minute but alwaysnon-homogenous distribution of the caoutchouc in the productsmanufactured. For that purpose a primary productof the caoutchouc, i. e.latex is mixed with the spinning 9 solution, suitably in the form of theknown commercial concentrates. The emulsification of the latex can beeasily carried through in all such spinning solutions which are alkalinefor instance in the viscose and in the cuprammonium solution ofcellulose. The spinning solutions uniformly mixed with latex can be spunin the .customary manner without any difliculty. When using viscose itis possible to make use in particular of acid precipitatingbathsgenerally knownvin the art. The small globules of latex having at themost a diameter of 0.02 millimetres, will passwithoutany hindrancethrough the fine but rather spacious spinning apertures without chokingthe latter.

The globules of latex having coagulated into caoutchouc can be foundafter precipi tation, washing and finishing of the products ly dividedstate. The latex obtained in the or luster in proportion to the quantityand manufactured,embedded in the mass in a fine-' concentration of thelatex preparation used. The latex preparations and concentrationsrespectively may be used in a vulcanizedor not vulcanized state and inthe claims where latex is referred to, either of said forms is intended.The invention may be applied to the manufacture of artificial silk orstaple fibre from viscose, cuprammonium solution of cellulose having anydesired degree of dull luster. It is also particularly adapted for themanufacture of artificial horse hair and bands, in which manufacturersand the industry specially give preference to products showing awax-like or dull surface. For influencing the luster of artificialsilkin order to obtain almost any degree of the luster of the usualartificial silk down to perfect dullness, it will sufiice to add to thespinning solutions a minimum quantity of 1 per cent up to about amaximum quantity of about 10 per cent of the known commercial per centconcentrates of latex, calculated on the spinning material contained inthe spinning solution. By changing the quantity of the added substanceit is possible to diminish the luster of the products obtained, in anydesired manner.

In the case of artificial horse hair or hands, where in particular apronounced dullness of the article is desired, there is no difficulty toadd to the spinning solutions or the products respectively a stillhigher percentage of added substance.

Example I Example [I The process is carriedthrough exactly in the samemanner as stated in Example I with the difference however, that the 60per cent concentrate of latex is applied in its vulcanized form. I

' Ewample III To a solution of. cuprammonium cellulose,- containing 7per cent of cellulose, 3 per cent of copper and per cent of ammonia,about 4 grams per litre of the 60 per cent concentrate of latex eithervulcanized or not, are added, whereupon the well agitated solution isspunifin the well known manner.

Weclaim: 1. The method of producing artificial silk and the like ofdiminished luster comprising in combination the step of adding to an valkaline cellulosic solution a concentrate of:

caoutchouc latex, spinning the mixture into a thread and treating thethread so obtained in the usual manner.

tex, spinning the solution into filaments and treating the filaments soobtained in the usual manner. 1 r

4. The method of producing artificial silk and the like of diminishedluster,-compris-- ing in combination, the step of adding to an alkalinecellulosic spinning solution concentrates of caoutchouc latex, thequantity thereof ranging from one to ten per cent calculated on thequantity of the spinning substance contained in the spinning solution,spinning the mixture into artificial filaments and in treating thefilaments so obtained in the usual manner. I a

5. The method of producing artificial silk and the like of diminishedluster, compris-' ing in combination, the step of adding to acuprammonium spinning solution concent-rates of caoutchouc latex, thequantity thereof ranging-from one to ten per cent calculated on thequantity of the spinning substance contained in the spinning solution,

- spinning the mixture into artificial filaments and in treating thefilaments so obtained in the usual manner.

6. The method of producing artificial silk and the like of diminishedluster, comprising in combination the step of uniformly emulsifyingconcentrates of caoutchouc latex in an alkaline cellulosic spinningsolution, spinning the mixture into filaments, and treating thefilaments so formed in the usual manner.

7. The method of producing artificial silk I and the like of diminishedluster comprising 1n combination the steps of adding to an alkalinecellulose solution a concentrate of latex in vulcanized form, spinningthe mixture into a thread and treating the thread so obtained in theusual manner.

8. A cellulosic artificial silk filament of the class consistingofviscose and cu'prammonium filaments having its luster diminished byhaving dispersed through its mass a concentrate of latex in vulcanizedform.-

9. A cellulosic artificial silk filament of the class consisting ofviscose and cuprammonium filaments havin its luster diminished by havingdisperse through its mass a concentrate of latex the quantity thereofranging from one to ten r cent calculated on the quantity of thecellulose in the filament. 4

In witness whereof, we have-hereunto signed our names.

JOHANN JOSEF sTooKLY. ERHARD WIT'rE;

III

